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zubka84 [21]
3 years ago
8

For the function y = -10x find the matching y-value when x = 3​

Mathematics
2 answers:
alexgriva [62]3 years ago
7 0

Answer:

-30

Step-by-step explanation:

y = -10x is a function that can also be represented by f(x)  = -10x.  We are to evaluate this function at x = 3.  To do this, replace both instances of x in this function by 3 and simplify the result:

f(3) =   -10(3) = -30

Alchen [17]3 years ago
6 0

Answer:

y= -30

Step-by-step explanation:

THis is because you substitue 3  for X and then multiply -10 and 3 and a negative times a positive is a negative so -10 times 3 is -30

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3 years ago
Twin brothers, Billy and Bobby, kid mother grandparents lawn together for 60 minutes. Billy could mow the lawn by himself in 20
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Answer:

Bobby around 131 minutes and Billy around 111 minutes

Step-by-step explanation:

To solve the problem it is important to raise equations regarding what happens.

 They tell us that Billy (Bi) and Bobby (Bo) can mow the lawn in 60 minutes. That is to say that what they prune in a minute is giving as follows:

1 / Bo + 1 / Bi = 1/60 (1)

They say Billy could mow the lawn only in 20 minutes less than it would take Bobby, therefore

1 / Bi = 1 / (Bo-20) (2)

Replacing (2) in (1) we have:

1 / Bo + 1 / (Bo-20) = 1/60

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Rearranging:

Bo ^ 2 - 140Bo -1200 = 0

Now applying the general equation

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Checking with equation 1:

1/131 +1/111 = ~ 1/60

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